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Related party balances and transactions - Balances with related parties (Details) - ARS ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
CURRENT ASSETS |  |
Total cash and cash equivalents |  | $ 2
Total trade receivables, net | $ 1 | 1
CURRENT LIABILITIES |  |
Total trade payables | 2 | 21
Financial Debt - Notes (current and non-current) |  | 323
Banco Atlas S.A. |  |
CURRENT ASSETS |  |
Total cash and cash equivalents |  | 2
Editorial Azeta S.A. |  |
CURRENT ASSETS |  |
Total trade receivables, net | 1 | 1
Experta ART S.A. |  |
CURRENT LIABILITIES |  |
Total trade payables |  | 16
Financial Debt - Notes (current and non-current) |  | 151
Haras El Capricho S.A. |  |
CURRENT LIABILITIES |  |
Total trade payables |  | 1
Telteco S.A. |  |
CURRENT LIABILITIES |  |
Total trade payables |  | 4
Penta S.A. |  |
CURRENT LIABILITIES |  |
Total trade payables | $ 2 |
La Estrella Sociedad Anonima de Seguros de Retiro |  |
CURRENT LIABILITIES |  |
Financial Debt - Notes (current and non-current) |  | $ 172

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- Definition The amount of cash and cash equivalents in related party transactions. + References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | teo_CurrentAssetsRelatedPartyTransactionsAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | teo_CurrentLiabilitiesRelatedPartyTransactionsAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of financial debt in related party transactions. + References No definition available. + Details
Name: | teo_FinancialDebtRelatedPartyTransactions
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of trade payables in related party transactions. + References No definition available. + Details
Name: | teo_TradePayablesRelatedPartyTransactions
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of trade receivables in related party transactions. + References No definition available. + Details
Name: | teo_TradeReceivablesRelatedPartyTransactions
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_BancoAtlasS.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_EditorialAzetaS.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_ExpertaArtS.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_HarasElCaprichoS.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_TeltecoS.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_PentaS.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=teo_LaEstrellaSociedadAnonimaDeSegurosDeRetiroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |